WO2021162377A1

WO2021162377A1 - Stacked antenna body and display apparatus comprising same

Info

Publication number: WO2021162377A1
Application number: PCT/KR2021/001639
Authority: WO
Inventors: 류한섭; 안유미; 윤호동; 이원희; 이재현
Original assignee: 동우화인켐 주식회사
Priority date: 2020-02-10
Filing date: 2021-02-08
Publication date: 2021-08-19
Also published as: US20220393335A1; CN113258274A; CN215989229U

Abstract

The stacked antenna body according to the embodiments of the present invention comprises: a protective layer; and an antenna electrode layer, directly on one surface of the protective layer, having a first electrode layer and a second electrode layer having a lower reflectance than the first electrode layer. The electrode can be prevented from being visible by means of the second electrode layer.

Description

Antenna stack and display device including same

The present invention relates to an antenna stack and a display device including the same. More particularly, it relates to an antenna stack including an antenna electrode layer and an insulating structure, and a display device including the same.

With the recent development of an information society, wireless communication technologies such as Wi-Fi and Bluetooth are combined with a display device and implemented in the form of, for example, a smart phone. In this case, an antenna may be coupled to the display device to perform a communication function.

As the display device is miniaturized, an antenna may be disposed in a display area of the display device, and in this case, a conductive pattern included in the antenna may be recognized by a user, thereby deteriorating image quality of the display device.

An optical structure such as a polarizing plate and various sensor structures may be included in the display device. Accordingly, when the antenna is included in the display device, interference between the optical structure and the sensor structure may occur.

In addition, a space in which the antenna can be accommodated may be limited by the optical structure and the sensor structure. When an additional film or structure is formed for antenna insertion, the overall thickness and volume of the display device may be increased.

Therefore, it is necessary to design an antenna to secure sufficient radiation characteristics and gain characteristics without interference with other functional structures in a limited space.

For example, Korean Patent Application Laid-Open No. 2013-0113222 discloses an antenna structure embedded in a portable terminal, but does not sufficiently disclose an antenna design in consideration of both optical and radiation characteristics in a display device as described above.

One object of the present invention is to provide an antenna stack having improved radiation characteristics and optical characteristics.

One object of the present invention is to provide a display device including an antenna stack having improved radiation characteristics and optical characteristics.

1. protective layer; and an antenna electrode layer formed directly on one surface of the protective layer and including a first electrode layer and a second electrode layer having a lower reflectance than that of the first electrode layer.

2. In the above 1, the second electrode layer is formed directly on the lower surface of the protective layer, the first electrode layer is formed on the second electrode layer, and the upper surface of the protective layer corresponds to the user's viewing surface. , antenna stack.

3. The antenna stack according to 1 above, wherein the second electrode layer includes a copper-oxygen containing composite material.

4. The above 3, wherein the copper-oxygen-containing composite material further contains an additional metal, wherein the additional metal is chromium (Cr), molybdenum (Mo), tungsten (W), magnesium (Mg), calcium (Ca) , An antenna stack comprising at least one selected from the group consisting of lanthanum (La), cesium (Cs) and indium (In).

5. The antenna stack according to 1 above, wherein the first electrode layer includes a metal layer.

6. The antenna laminate according to the above 5, wherein the first electrode layer has a multilayer structure of the metal layer and the transparent conductive oxide layer.

7. The method of 1 above, further comprising: a polarization layer disposed under the antenna electrode layer; and a first adhesive layer formed between the antenna electrode layer and the polarization layer.

8. The antenna stack according to 7 above, further comprising a touch sensor layer disposed under the polarization layer.

9. The antenna stack according to 8 above, further comprising a second adhesive layer formed between the polarization layer and the touch sensor layer.

10. The above 1, wherein the thickness of the protective layer is less than 100㎛, the antenna laminate.

11. Polarizing layer; an antenna electrode layer disposed on the polarization layer and including a first electrode layer and a second electrode layer formed on the first electrode layer and having a lower reflectance than the first electrode layer; and a protective layer disposed on the second electrode layer and disposed toward a user's viewing surface.

12. The antenna laminate according to 11 above, wherein the second electrode layer includes a copper-oxygen containing composite material.

13. The above 12, wherein the copper-oxygen-containing composite material further contains an additional metal, wherein the additional metal is chromium (Cr), molybdenum (Mo), tungsten (W), magnesium (Mg), calcium (Ca) , An antenna stack comprising at least one selected from the group consisting of lanthanum (La), cesium (Cs) and indium (In).

14. The antenna stack according to 11 above, wherein the first electrode layer includes a metal layer.

15. The antenna laminate according to the above 14, wherein the first electrode layer has a multilayer structure of the metal layer and the transparent conductive oxide layer.

16. The antenna stack according to 11 above, wherein the thickness of the antenna electrode layer is 1000 to 5000 Å.

17. The antenna stack of 11 above, further comprising a base dielectric layer disposed under the polarizing layer.

18. The antenna stack according to the above 11, further comprising an antenna base layer disposed between the polarization layer and the antenna electrode layer.

19. Display panel; and an antenna stack according to the above-described embodiments disposed on the display panel.

The antenna stack according to embodiments of the present invention may include an antenna electrode layer formed directly on the protective layer. Accordingly, the adhesive layer for attaching the antenna electrode layer on the protective layer may be omitted, so that the radiation intensity to the upper surface of the protective layer may be further increased.

In addition, the adhesive layer may be formed between, for example, the antenna electrode layer and the polarizing plate. Accordingly, the adhesive layer may be provided as an antenna dielectric layer of the antenna electrode layer together with the polarizing plate. Accordingly, a sufficient thickness of the antenna dielectric layer may be secured to prevent signal loss, and radiation reliability may be further improved.

The antenna stack according to embodiments of the present invention may include an antenna electrode layer disposed between a protective cover film and a polarizing layer. Since the antenna electrode layer is disposed under the protective cover film provided as, for example, a window film or a cover glass, a radiation characteristic may be improved while sensitivity to an external signal is improved. In addition, since the polarization layer may be used as a dielectric layer of the antenna electrode layer, radiation reliability may be further improved while preventing signal loss.

According to example embodiments, the antenna electrode layer may include a first electrode layer and a second electrode layer having a lower reflectance than the first electrode layer. The second electrode layer may prevent the antenna electrode layer from being visually recognized by the user while maintaining improved optical properties and gain properties.

1 is a schematic cross-sectional view of an antenna stack according to exemplary embodiments.

2 is a schematic cross-sectional view of an antenna stack according to some exemplary embodiments.

3 is a schematic cross-sectional view of an antenna stack according to exemplary embodiments.

4 is a schematic cross-sectional view of an antenna stack according to some exemplary embodiments.

5 is a schematic plan view illustrating a structure of an antenna pattern included in an antenna electrode layer according to example embodiments.

6 is a schematic plan view illustrating a structure of an antenna pattern included in an antenna electrode layer according to some exemplary embodiments.

7 is a schematic cross-sectional view illustrating a display device according to example embodiments.

Embodiments of the present invention provide an antenna stack in which a multi-layered antenna electrode layer and a protective layer are combined.

The antenna electrode layer included in the antenna stack may be a microstrip patch antenna manufactured in the form of a transparent film. The antenna stack may be applied to, for example, a communication device for high-frequency or ultra-high frequency (eg, 3G, 4G, 5G or higher) mobile communication.

In addition, embodiments of the present invention provide a display device including the antenna stack. An application target of the antenna stack is not limited to a display device, and may be applied to various objects or structures such as vehicles, home appliances, and buildings.

Hereinafter, with reference to the drawings, embodiments of the present invention will be described in more detail. However, the following drawings attached to the present specification illustrate preferred embodiments of the present invention, and serve to further understand the technical spirit of the present invention together with the above-described content of the present invention, so the present invention is described in such drawings It should not be construed as being limited only to the matters.

The terms "first", "second", etc. included in the present application are used to distinguish different components and members, and do not limit the absolute position or order.

Referring to FIG. 1 , the antenna stack may include a protective layer 150 and an antenna electrode layer 100 . The antenna stack may further include a polarization layer 140 disposed under the antenna electrode layer 100 .

According to exemplary embodiments, the protective layer 150 may be provided as, for example, a window cover of a display device, a cover glass (eg, ultra-thin glass (UTG)), a protective cover film, or a protective cover layer. can In this case, the protective layer 150 may be provided as the user's viewing surface or the outermost surface of the display device.

The protective layer 150 may include, for example, glass or a flexible resin material such as polyimide, polyethylene terephthalate (PET), an acrylic resin, or a siloxane-based resin.

In some embodiments, the thickness of the protective layer 150 may be less than about 100 μm. For example, the thickness of the protective layer 150 may be about 10 μm or more and less than about 100 μm. Preferably, the thickness of the protective layer 150 may be about 10 to 50 μm. Excessive variations in the radiation axis and the resonance frequency through the antenna electrode layer 100 within the thickness range may be suppressed.

The antenna electrode layer 100 may be disposed under the protective layer 150 . For example, the antenna electrode layer 100 may be laminated on an inner surface (eg, bottom surface) opposite to the viewing surface (eg, top surface) of the protective layer 150 .

The antenna electrode layer 100 may include a first electrode layer 110 and a second electrode layer 120 . According to exemplary embodiments, the second electrode layer 120 is disposed adjacent to the first electrode layer 110 with respect to the viewing surface or the protective layer 150 , and includes a conductive material having a lower reflectance than the first electrode layer 110 . may include

For example, the first electrode layer 110 may include silver (Ag), gold (Au), copper (Cu), aluminum (Al), platinum (Pt), palladium (Pd), chromium (Cr), or titanium (Ti). , tungsten (W), niobium (Nb), tantalum (Ta), vanadium (V), iron (Fe), manganese (Mn), cobalt (Co), nickel (Ni), zinc (Zn), molybdenum (Mo) , calcium (Ca), or an alloy containing at least one of them. These may be used alone or in combination of two or more. For example, the first electrode layer 110 may be formed of silver (Ag) or a silver alloy (eg, silver-palladium-copper (APC) alloy), or copper (Cu) or copper alloy for low resistance implementation and fine patterning. (eg, copper-calcium (CuCa)).

In some embodiments, the first electrode layer 110 is transparent, such as indium tin oxide (ITO), indium zinc oxide (IZO), indium zinc tin oxide (ITZO), tin oxide (SnOx), or zinc oxide (ZnOx). may contain conductive oxides

For example, the first electrode layer 110 may have a multilayer structure including a metal or alloy layer and a transparent conductive oxide layer. In some embodiments, the first electrode layer 110 includes a two-layer structure including a transparent conductive oxide layer-metal layer or a three-layer structure including a first transparent conductive oxide layer-metal layer-second transparent conductive oxide layer. can do.

The first electrode layer 110 may be formed on the second electrode layer 120 . In example embodiments, the first electrode layer 110 may be directly formed on the surface of the second electrode layer 120 .

As described above, the second electrode layer 120 may include a conductive material having a lower reflectance than the first electrode layer 110 . For example, the second electrode layer 120 may be provided as a substantially blackening layer.

In some embodiments, the second electrode layer 120 may include a copper-oxygen-containing conductive composite material. In some embodiments, the second electrode layer 120 may further contain an additional metal (M) other than copper.

Additional metals (M) include, for example, chromium (Cr), molybdenum (Mo), tungsten (W), magnesium (Mg), calcium (Ca), lanthanum (La), cesium (Cs), indium (In), etc. may include. These may be used alone or in combination of two or more.

In one embodiment, in consideration of the improvement of transmittance through the antenna electrode layer 100 , the additional metal M may include indium. In this case, the second electrode layer 120 may include a copper-indium-oxygen (Cu-In-O) composite or a composite of a copper-oxygen-containing compound and an indium-oxygen-containing compound.

In the second electrode layer 120 , elemental oxygen may be doped or incorporated into the second electrode layer 120 without losing the conductivity of the copper and/or the additional metal (M). The second electrode layer 120 may be blackened or partially oxidized by the oxygen element to serve as an anti-reflection layer for the first electrode layer 110 .

For example, the second electrode layer 120 may be formed through a sputtering process using a copper target (or copper-oxygen target) and an additional metal target (or additional metal-oxygen target), or a copper-addition metal-oxygen target. can

In one embodiment, the antenna electrode layer 100 may be formed in a mesh structure. The antenna electrode layer 100 may include an antenna pattern 105 , and the configuration and structure of the antenna pattern 105 will be described in more detail with reference to FIG. 5 .

In some embodiments, the thickness of the antenna electrode layer 100 may be about 5000 Å or less, preferably about 1000 to 5000 Å. While preventing an increase in resistance of the antenna electrode layer 100 within the above range, it is possible to suppress a color shift phenomenon on the viewing surface of the antenna stack.

According to exemplary embodiments, the antenna electrode layer 100 may be directly formed on the protective layer 150 . The protective layer 150 may be provided as an antenna substrate for forming the antenna electrode layer 100 .

For example, the second electrode layer 120 may be directly formed on the bottom surface of the protective layer 150 through the sputtering process described above. Thereafter, the first electrode layer 110 may be formed on the second electrode layer 120 .

As described above, the upper surface of the antenna electrode layer 100 may be in direct contact with the protective layer 150 . In some embodiments, the bottom surface of the antenna electrode layer 100 may be combined with the polarization layer 140 .

The polarizing layer 140 may include a coated polarizer or a polarizing plate. The coating-type polarizer may include a liquid crystal coating layer including a polymerizable liquid crystal compound and a dichroic dye. In this case, the polarizing layer 140 may further include an alignment layer for imparting alignment to the liquid crystal coating layer.

For example, the polarizing plate may include a polyvinyl alcohol-based polarizer and a protective film attached to at least one surface of the polyvinyl alcohol-based polarizer.

A first adhesive layer 130 may be disposed between the polarization layer 140 and the antenna electrode layer 100 . For example, after the first adhesive layer 130 is formed on the surface of the first electrode layer 110 or the polarization layer 140 , the antenna electrode layer 100 and the polarization layer 140 may be attached to each other. The first adhesive layer 130 may include, for example, a pressure-sensitive adhesive (PSA) or an optically transparent adhesive (OCA) including an acrylic resin, a silicone-based resin, an epoxy-based resin, and the like.

One end of the antenna electrode layer 100 may be electrically connected to the circuit connection structure 180 . The circuit connection structure 180 may include, for example, a flexible printed circuit board (FPCB).

According to the above-described exemplary embodiments, the antenna electrode layer 100 may be disposed between the polarization layer 140 and the protective layer 150 . Accordingly, since the antenna electrode layer 100 is disposed closer to the viewing surface or the outer surface of the display device, radiation intensity and sensitivity may be further improved.

In addition, the polarization layer 140 may be disposed under the antenna electrode layer 100 to serve as an antenna dielectric layer for the antenna electrode layer 100 together with the first adhesive layer 130 .

In the comparative example, the polarization layer 140 is attached to the protective layer 150 through an adhesive layer, the antenna electrode layer 100 is disposed under the polarization layer 140 , and the antenna base layer is under the antenna electrode layer 100 . This can be placed In this case, the antenna base layer may function substantially as a single antenna dielectric layer.

However, according to exemplary embodiments, since the antenna base layer is omitted and the antenna electrode layer 100 is directly formed on the protective layer 150 , the thickness of the entire stack may be reduced. In addition, since the first adhesive layer 130 and the polarization layer 140 are provided together as an antenna dielectric layer, the total thickness of the antenna dielectric layer may be increased.

According to the above-described exemplary embodiments, it is possible to secure a sufficient thickness of the antenna dielectric layer for the antenna electrode layer 100 . Accordingly, for example, it is possible to improve radiation independence and radiation efficiency through the antenna electrode layer 100 while preventing signal loss and signal interference from electrodes and wires included in the display panel to which the antenna stack is applied.

As the antenna electrode layer 100 is adjacent to the viewing surface, light reflection and electrode visibility that may be increased from the viewing surface may be reduced through the second electrode layer 120 . Accordingly, it is possible to implement an antenna stack having improved optical properties and antenna radiation properties.

2 is a schematic cross-sectional view of an antenna stack according to some exemplary embodiments. Detailed descriptions of configurations and structures that are substantially the same as or similar to those described with reference to FIG. 1 will be omitted.

Referring to FIG. 2 , the antenna stack may further include a touch sensor layer 160 . The touch sensor layer 160 may include, for example, capacitive sensing electrodes. For example, the column direction sensing electrodes and the row direction sensing electrodes may be arranged to cross each other. The touch sensor layer 160 may further include traces connecting the sensing electrodes and the driving IC chip. The touch sensor layer 160 may further include a substrate on which the sensing electrodes and the traces are formed.

The touch sensor layer 160 may be coupled to the polarization layer 140 through the second adhesive layer 135 . In this case, the second adhesive layer 135 may also be provided as an antenna dielectric layer together with the first adhesive layer 130 and the polarization layer 140 .

The sensing electrodes and/or traces included in the touch sensor layer 160 may function as an antenna ground layer for the antenna electrode layer 100 (eg, the radiation pattern 102 ).

As described above, since a sufficient thickness of the antenna dielectric layer is ensured between the antenna electrode layer 100 and the touch sensor layer 160, while maintaining the function of the antenna ground layer, signal absorption and gain by the sensing electrodes and/or traces reduction can be prevented.

3 is a schematic cross-sectional view of an antenna stack according to exemplary embodiments. Detailed descriptions of configurations and structures that are substantially the same as or similar to those described with reference to FIG. 1 will be omitted.

Referring to FIG. 3 , as described with reference to FIG. 1 , the antenna stack may include a protective layer 150 , an antenna electrode layer 100 , and a polarization layer 140 . As described above, the antenna electrode layer 100 may include the first electrode layer 110 and the second electrode layer 120 . The antenna electrode layer 100 may be disposed between the protective layer 150 and the polarization layer 140 .

In some embodiments, a base dielectric layer 145 may be disposed under the polarization layer 140 .

The base dielectric layer 145 may include an insulating material having a predetermined dielectric constant. The base dielectric layer 145 may include, for example, an inorganic insulating material such as glass, silicon oxide, silicon nitride, or metal oxide, or an organic insulating material such as an epoxy resin, an acrylic resin, or an imide-based resin.

For example, a transparent film may be provided as the base dielectric layer 145 . The transparent film may include, for example, polyester-based resins such as polyethylene terephthalate, polyethylene isophthalate, polyethylene naphthalate, and polybutylene terephthalate; Cellulose resins, such as a diacetyl cellulose and a triacetyl cellulose; polycarbonate-based resin; acrylic resins such as polymethyl (meth)acrylate and polyethyl (meth)acrylate; styrenic resins such as polystyrene and acrylonitrile-styrene copolymer; polyolefin-based resins such as polyethylene, polypropylene, polyolefin having a cyclo-based or norbornene structure, and an ethylene-propylene copolymer; vinyl chloride-based resin; amide resins such as nylon and aromatic polyamide; imide-based resin; polyether sulfone-based resin; sulfone-based resins; polyether ether ketone resin; sulfide polyphenylene-based resin; vinyl alcohol-based resin; vinylidene chloride-based resin; vinyl butyral-based resin; allylate-based resin; polyoxymethylene-based resins; epoxy resin; urethane or acrylic urethane; and silicone-based resins. These may be used alone or in combination of two or more.

In some embodiments, the base dielectric layer 145 may include an adhesive layer or an adhesive film, such as an optically clear adhesive (OCA), an optically clear resin (OCR), or the like.

In some embodiments, the dielectric constant of the base dielectric layer 145 may be adjusted in a range of about 1.5 to 12. When the dielectric constant exceeds about 12, the driving frequency of the antenna electrode layer 100 is excessively reduced, so that driving in a desired high frequency band may not be realized.

In addition, the polarization layer 140 may be disposed under the antenna electrode layer 100 to serve as a dielectric layer for the antenna electrode layer 100 . In some embodiments, the polarization layer 140 may be provided together as a dielectric layer for the antenna electrode layer 100 together with the base dielectric layer 145 .

Accordingly, compared to the case in which the antenna electrode layer 100 is disposed under the polarization layer 140 and the base dielectric layer 145 is disposed under the antenna electrode layer 100, the thickness of the entire stack is maintained while the antenna electrode layer 100 is maintained. ), the thickness of the entire dielectric layer can be increased.

As described above, according to exemplary embodiments, a sufficient thickness of the dielectric layer for the antenna electrode layer 100 may be secured. Accordingly, for example, it is possible to improve radiation independence and radiation efficiency through the antenna electrode layer 100 while preventing signal loss and signal interference from electrodes and wires included in the display panel to which the antenna stack is applied.

4 is a schematic cross-sectional view of an antenna stack according to some exemplary embodiments. Detailed descriptions of configurations and structures substantially the same as or similar to those described with reference to FIG. 3 will be omitted.

Referring to FIG. 4 , the antenna electrode layer 100 may be attached to the protective layer 150 through the adhesive layer 147 . The adhesive layer 147 may include, for example, a pressure-sensitive adhesive (PSA) or an optically transparent adhesive (OCA) including an acrylic resin, a silicone-based resin, or the like.

The antenna electrode layer 100 may be formed on the antenna base layer 90 . The antenna base layer 90 may be provided as a substrate or a base layer for deposition and etching processes of the antenna electrode layer 100 .

The antenna base layer 90 may be provided as an antenna dielectric layer together with the polarization layer 140 . Accordingly, the thickness of the antenna dielectric layer may be additionally secured.

The antenna base layer 90 may include an insulating film material commonly used in a display manufacturing process. For example, the antenna base layer 90 may include a material substantially the same as or similar to that of the base dielectric layer 145 described with reference to FIG. 3 .

As described with reference to FIG. 3 , a base dielectric layer 145 may be further included under the polarization layer 140 .

Referring to FIG. 5 , the antenna pattern 105 may include a radiation pattern 102 , a transmission line 104 , and a pad 106 .

The radiation pattern 102 may have, for example, a polygonal plate shape, and the transmission line 104 may extend from one side of the radiation pattern 102 to be electrically connected to the signal pad 107 . The transmission line 104 may be formed as a single member substantially integral with the radiation pattern 102 .

In some embodiments, pad 106 includes signal pad 107 and may further include ground pad 109 . For example, a pair of ground pads 109 may be disposed with the signal pad 107 interposed therebetween. The ground pads 109 may be electrically isolated from the signal pad 107 and the transmission line 104 .

In one embodiment, the ground pad 109 may be omitted. Further, the signal pad 107 may be provided as an integral member at the end of the transmission line 104 .

The pad 107 may be electrically connected to an antenna driving integrated circuit (IC) chip through a circuit connection structure 180 (refer to FIG. 1 ) such as, for example, a flexible printed circuit board. Accordingly, power feeding and driving control to the antenna pattern 105 may be performed through the antenna driving IC chip.

Referring to FIG. 6 , the radiation pattern 102 may have a mesh structure. In some embodiments, the transmission line 104 connected to the radiation pattern 102 may also have a mesh structure.

As the radiation pattern 102 includes a mesh structure, transmittance is improved even when the radiation pattern 102 is disposed in the display area of the display device, thereby preventing electrode visibility and deterioration of image quality.

A dummy mesh pattern 103 may be disposed around the radiation pattern 102 and the transmission line 104 . The dummy mesh pattern 103 may be electrically and physically spaced apart from the radiation pattern 102 and the transmission line 104 through the separation region 85 .

For example, as described above, the antenna electrode layer 100 including the first electrode layer 110 and the second electrode layer 120 may be formed on the antenna base layer 90 . Thereafter, the separation region 85 may be formed by partially etching the antenna electrode layer 100 along the profile of the radiation pattern 102 and the transmission line 104 while forming a mesh structure. Accordingly, a part of the antenna electrode layer 100 may be converted into the dummy mesh pattern 103 .

In some embodiments, the pad 106 may be formed in a solid structure to reduce the feeding resistance. For example, the pad 106 may be disposed in a non-display area or a light blocking area of the display device to be bonded or connected to the flexible circuit board and/or the antenna driving IC chip.

Accordingly, the pad 106 may be disposed outside the user's viewing area. In one embodiment, the pad 106 may be comprised of a metal or alloy. In an embodiment, the pad 106 may not include the second electrode layer 120 .

In an embodiment, at least a portion of the transmission line 104 also has a solid structure, and may be disposed in the non-display area together with the pad 106 .

Referring to FIG. 7 , the above-described antenna stack may be stacked on the display panel 200 .

The display panel 200 may include a pixel electrode 210 , a pixel defining layer 220 , a display layer 230 , a counter electrode 240 , and an encapsulation layer 250 disposed on a panel substrate 205 . can

A pixel circuit including a thin film transistor (TFT) may be formed on the panel substrate 205 , and an insulating layer covering the pixel circuit may be formed. The pixel electrode 210 may be electrically connected to, for example, a drain electrode of a TFT on the insulating layer.

The pixel defining layer 220 may be formed on the insulating layer to expose the pixel electrode 210 to define a pixel area. A display layer 230 is formed on the pixel electrode 210 , and the display layer 230 may include, for example, a liquid crystal layer or an organic light emitting layer. Preferably, the display layer 230 includes an organic light emitting layer, and the display panel 200 may be an OLED panel.

The counter electrode 240 may be disposed on the pixel defining layer 220 and the display layer 230 . The counter electrode 240 may be provided as, for example, a common electrode or a cathode of the display device. An encapsulation layer 250 for protecting the display panel 200 may be stacked on the opposite electrode 240 .

The above-described antenna stack is stacked on the display panel 200 , and the touch sensor layer 160 , the polarization layer 140 , and the antenna electrode layer 100 may be sequentially stacked from the display panel 200 .

Since the

adhesive layers

130 and 135 and the polarization layer 140 are provided together as an antenna dielectric layer, signal absorption and signal loss by the electrodes and wires included in the touch sensor layer 160 and the display panel 200 are prevented. While doing so, sufficient inductance or capacitance for driving the antenna can be secured.

In addition, since the polarization layer 140 is disposed on the touch sensor layer 160 , light reflection from sensing electrodes included in the touch sensor layer 160 and electrode visibility may be reduced.

As described above, since the antenna electrode layer 100 is disposed adjacent to the protective layer 150 provided as a window cover, signal sensitivity and gain amount are improved, and the reflectance is reduced by the second electrode layer 120 . Visibility of the antenna electrode layer 100 may be reduced.

Hereinafter, experimental examples are presented to help the understanding of the present invention, but the following experimental examples are merely illustrative of the present invention and do not limit the appended claims, and are within the scope and spirit of the present invention. It is obvious to those skilled in the art that various changes and modifications are possible, and it is natural that such variations and modifications fall within the scope of the appended claims.

실험예 1: 전극 시인 평가Experimental Example 1: Electrode visibility evaluation

Example 1

A polarizing plate (thickness: 98 μm) including a PVA polarizer and a triacetyl cellulose (TAC) protective film formed on both surfaces of the polarizer was prepared. A first electrode layer formed of APC was formed on the polarizing plate, and a CuO+In ₂ O ₃ second electrode layer was formed on the first electrode layer through a sputtering process. The thicknesses of the first electrode layer and the second electrode layer were 2000 Å and 300 Å, respectively.

The antenna electrode layer including the first electrode layer and the second electrode layer was etched into a mesh structure having a line width of 1.8 μm, and a glass cover (thickness: 500 μm) was attached on the antenna electrode layer.

실시예 2Example 2

An antenna laminate was manufactured in the same manner as in Example 1, except that the line width of the antenna electrode layer mesh structure was formed to be 3 μm.

비교예comparative example

An antenna laminate was manufactured in the same manner as in Example 2, except that the positions of the antenna electrode layer and the polarizer were changed (that is, the antenna electrode layer-polarizer plate-glass cover laminate), and the second electrode layer was omitted from the antenna electrode layer.

Ten panelists were asked to observe the antenna laminates of Examples and Comparative Examples on a glass cover, and to evaluate whether the electrodes included in the antenna electrode layer were visible. The evaluation grade is as follows

i) Class 0: electrode completely invisible

ii) Class 1: 1-2 poets

iii) Grade 2: 3-4 poets

iv) Grade 3: 5-6 poets

v) Class 4: 7-9 poets

vi) Class 5: 10 poets

As a result of the evaluation, Example 1 was evaluated as 0 grade, Example 2 was evaluated as 1 grade, and Comparative Example was evaluated as 3 grade.

실험예 2: 컬러 시프트 평가Experimental Example 2: Color shift evaluation

In the antenna stack of Example 1 of Experimental Example 1, the total thickness of the antenna electrode layer was adjusted while changing the thickness of the first electrode layer. It was evaluated whether color shift was observed when observed on the glass cover while changing the total thickness of the antenna electrode layer.

Using a colorimeter (manufactured by Olympus, OPS-200), it was determined that color shift occurred when the R, G, and B chromaticity coordinate values according to the thickness of the electrode layer were out of the standard.

Specifically, (R: 0.683, 0.314), (G: 0.249, B: 0.701), and (B: 0.136, 0.052) were set as the color coordinate reference values, and when it was outside the range of ±0.005 from the reference value, it was determined that color shift occurred. .

The evaluation results are shown in Table 1 below.

안테나 전극층 총 두께antenna electrode layer total thickness	컬러 시프트 color shift
1000 Å1000 Å	미발생non-occurring
2500 Å2500 Å	미발생non-occurring
5000 Å5000 Å	미발생non-occurring
5500 Å5500 Å	발생generation
6000 Å6000 Å	발생generation

Referring to Table 1, color shift was observed while the thickness of the antenna electrode layer exceeded about 5000 Å. From the above results, it can be predicted that, for example, when the antenna electrode layer is formed to a thickness of 1000 to 5000 Å, image deterioration and electrode visibility due to color shift can be suppressed while sufficiently lowering the resistance.

실험예 3: 보호층(커버 글래스) 두께 변화에 따른 안테나 성능 평가Experimental Example 3: Antenna performance evaluation according to the change in the thickness of the protective layer (cover glass)

_{A CuO+In 2} O ₃ second electrode layer was formed on the protective cover film made of glass through a sputtering process, and a first electrode layer including APC was formed on the second electrode layer. The thickness of the first electrode layer and the second electrode layer was 2400 Å and 300 Å, respectively.

A polarizing plate (thickness: 98 μm) including a PVA polarizer and a triacetyl cellulose (TAC) protective film formed on both surfaces of the polarizer was prepared. The polarizing plate was attached to the second electrode layer using a commercially available OCA film (thickness: 100 μm).

The antenna laminate samples shown in Table 2 below were prepared while varying the thickness of the cover glass. The radial axis angle and resonant frequency of the sample (thickness 0) in which the cover glass was omitted were used as reference values.

Power was applied to the antenna electrode layer, and the tilt angle of the radiation axis was confirmed in the range of 90 degrees to 180 degrees and the resonance frequency 0 to 40 GHz with respect to the main resonance frequency using a communication module (Anoki Board).

The evaluation results are shown in Table 2 below.

글래스 두께 (㎛)Glass thickness (μm)	방사축 틸팅 각도( ^o)radial axis Tilt angle ( ^o )	공진 주파수 (GHz)resonant frequency (GHz)
00	180180	31.331.3
1010	179179	29.729.7
3030	178178	29.029.0
5050	176176	28.128.1
7070	170170	27.927.9
9090	168168	27.727.7
9595	167167	27.527.5
100100	122122	27.327.3
150150	125125	24.324.3
500500	126126	23.123.1

Referring to Table 2, since the OCA layer and the polarizer are provided together as an antenna dielectric layer, substantially perfect vertical radiation (tilting angle 180 ^o ) and high-frequency radiation characteristics were realized in the absence of a cover glass.

When the cover glass thickness exceeds 100 μm, the shift of the resonance frequency is deepened as the tilting angle of the radial axis is excessively changed.

Claims

protective layer; and

An antenna stack comprising an antenna electrode layer formed directly on one surface of the protective layer and including a first electrode layer and a second electrode layer having a lower reflectance than that of the first electrode layer.
The method according to claim 1, wherein the second electrode layer is formed directly on the bottom surface of the protective layer, the first electrode layer is formed on the second electrode layer,

The upper surface of the protective layer corresponds to the user's viewing surface, the antenna stack.
The antenna stack of claim 1 , wherein the second electrode layer comprises a copper-oxygen containing composite material.
The method according to claim 3, wherein the copper-oxygen containing composite material further contains an additional metal, wherein the additional metal is chromium (Cr), molybdenum (Mo), tungsten (W), magnesium (Mg), calcium (Ca), lanthanum (La), comprising at least one selected from the group consisting of cesium (Cs) and indium (In), the antenna stack.
The antenna stack according to claim 1, wherein the first electrode layer comprises a metal layer.
The antenna laminate according to claim 5, wherein the first electrode layer has a multilayer structure of the metal layer and the transparent conductive oxide layer.
The method according to claim 1,

a polarization layer disposed under the antenna electrode layer; and

Further comprising a first adhesive layer formed between the antenna electrode layer and the polarizing layer, the antenna stack.
The antenna stack according to claim 7, further comprising a touch sensor layer disposed under the polarization layer.
The antenna stack according to claim 8, further comprising a second adhesive layer formed between the polarization layer and the touch sensor layer.
The method according to claim 1, The thickness of the protective layer is less than 100㎛, the antenna laminate.
polarizing layer;

an antenna electrode layer disposed on the polarization layer and including a first electrode layer and a second electrode layer formed on the first electrode layer and having a lower reflectance than the first electrode layer; and

and a protective layer disposed on the second electrode layer and disposed toward a user's viewing surface.
The antenna stack of claim 11 , wherein the second electrode layer comprises a copper-oxygen containing composite material.
13. The method of claim 12, wherein the copper-oxygen containing composite material further contains an additional metal, wherein the additional metal is chromium (Cr), molybdenum (Mo), tungsten (W), magnesium (Mg), calcium (Ca), lanthanum. (La), comprising at least one selected from the group consisting of cesium (Cs) and indium (In), the antenna stack.
The antenna stack of claim 11 , wherein the first electrode layer comprises a metal layer.
The antenna stack according to claim 14, wherein the first electrode layer has a multilayer structure of the metal layer and the transparent conductive oxide layer.
The antenna stack according to claim 11, wherein the thickness of the antenna electrode layer is 1000 to 5000 Å.
The antenna stack of claim 11 , further comprising a base dielectric layer disposed under the polarizing layer.
The antenna stack according to claim 11, further comprising an antenna base layer disposed between the polarization layer and the antenna electrode layer.
display panel; and

A display device comprising the antenna stack of any one of claims 1 to 18 disposed on the display panel.